木卫四的倾斜阻尼
Inclination damping on Callisto
摘要：
木卫四被认为拥有一个地下海洋，这将消耗能量，由于潮汐。这种耗散应该会将任何原始的倾斜度衰减到1个陀螺以内，然而木卫四仍然保持着现在的倾斜度。我们认为木卫四的倾角和偏心率都是在相对较近的过去（~0.3 Gyr）被激发的。这种激发发生在木卫四根据“共振锁定”模型向外迁移时，并通过与木卫三的2：1平均运动共振。木卫三的轨道要素同样受到同一事件的激发。为了解释目前的轨道要素，我们推导出固体潮汐k2/Q~0.05木卫四和木卫三显着较低的值。
英文摘要：
Callisto is thought to possess a subsurface ocean, which will dissipate energy due to obliquity tides. This dissipation should have damped any primordial inclination within 1 Gyr - and yet Callisto retains a present-day inclination. We argue that Callisto's inclination and eccentricity were both excited in the relatively recent past (~0.3 Gyr). This excitation occurred as Callisto migrated outwards according to the "resonance-locking" model and passed through a 2:1 mean-motion resonance with Ganymede. Ganymede's orbital elements were likewise excited by the same event. To explain the present-day orbital elements we deduce a solid-body tidal k2/Q~0.05 for Callisto and a significantly lower value for Ganymede.
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